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TM 10-3930-638-24&P
4-3. FUEL SYSTEM MAINTENANCE (cont)
a. Fuel Injector (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENTS (cont)
CAUTION
In following step, don’t manually bottom valve using excessive
force as bending of valve can result requiring fuel injector replace-
ment.
36
Valve lift
a. Pump fuel
adjustment
through
fuel injector,
hold pressure
adjusting
screw and
slowly turn
lift adjusting
screw clock-
wise until
valve ceases
to open
b. Raise pressure
200 to 500
PSI over
fuel injector
opening
pressure
c. To set lift,
turn lift
adjusting
screw (9)
counter-
clockwise
1/2 turn
d. Hold lift
adjusting
screw and
tighten lift
adjusting
screw locknut
e. Recheck open-
ing pressure
adjustment
and readjust
if necessary
f. Test fuel
injector
g. Remove fuel
injector from
test stand
Opening pressure for new fuel injectors is
3150 to 3250 PSI; for used fuel injectors
2950 to 3050 PSI. Some fuel may collect
on injector tip; however a rapid dribble
must not be apparent
Turning screw (9) 1/2 turn sets valve lift
0.009 inch off valve seat
Use tool P/N AN9508-6; tighten to 40-45
pounds-inch torque
4-87
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